Add run-cabal-gild action

.gitattributes

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+run-cabal-gild/dist/index.js linguist-generated=true

.gitignore

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+**/node_modules

run-cabal-gild/LICENSE.md

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+This code is an adaptation of https://github.com/haskell-actions/run-fourmolu
+which in turn was an adaptation. Here is the license as included in the
+`run-fourmolu` code:
+
+This code was originally written by Mark Karpov for Ormolu:
+https://github.com/mrkkrp/ormolu-action.  The following is the license for that
+code:
+
+Copyright © 2020–2022 Mark Karpov
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+* Neither the name Mark Karpov nor the names of contributors may be used to
+  endorse or promote products derived from this software without specific
+  prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS “AS IS” AND ANY EXPRESS
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+------------------------------------------
+
+The above repo has been updated to work with Fourmolu in this repository.
+This new code uses the following license:
+
+Copyright © 2022–present Bitnomial
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+* Neither the name Mark Karpov nor the names of contributors may be used to
+  endorse or promote products derived from this software without specific
+  prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS “AS IS” AND ANY EXPRESS
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

run-cabal-gild/README.md

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+# cabal-gild action
+
+This `run-cabal-gild` GitHub Action helps to ensure that your Haskell project is
+formatted with [cabal-gild](https://github.com/tfausak/cabal-gild). The action
+tries to find all Cabal source code files in your repository and fails if any
+of them are not formatted. In case of failure it prints the diff between the
+actual contents of the file and its formatted version.
+
+## Example usage
+
+In the simple case all you need to do is to add this step to your job:
+
+```yaml
+- uses: input-output-hk/actions/run-cabal-gild@v1
+  with:
+    version: "1.7.0.1"
+```
+
+The `1.7.0.1` should be replaced with the version of cabal-gild you want to use.  See
+[cabal-gild releases](https://github.com/tfausak/cabal-gild/releases) for all cabal-gild versions.
+If you don't specify this cabal-gild `version` input, the latest version of
+cabal-gild will be used.

run-cabal-gild/action.yml

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+name: 'Run cabal-gild'
+description: 'Check formatting of Cabal code with cabal-gild'
+inputs:
+  follow-symbolic-links:
+    required: false
+    description: >
+      Whether to follow symbolic links.
+    default: true
+  extra-args:
+    required: false
+    description: >
+      Extra arguments to pass to Fourmolu.
+  version:
+    required: false
+    description: >
+      The version number of cabal-gild to use. Defaults to "latest". Example
+      version numbers -- `0.13.0.0`, `0.10.1.0`, etc. See
+      https://github.com/tfausak/cabal-gild/releases for a list of all releases.
+    default: latest
+  working-directory:
+    description: >
+      Directory in which to run cabal-gild.  This also affects how the `pattern`
+      argument is interpretted, with Glob patterns being relative to this
+      `working-directory` argument.
+
+      Defaults to the repository root if not set.
+    required: false
+runs:
+  using: 'node20'
+  main: 'dist/index.js'